Emergency workers who fought the blaze at the Chernobyl nuclear reactor, stand during a commemoration ceremony marking the anniversary of the nuclear accident, in Russia's Siberian city of Krasnoyarsk, April 26, 2009. An explosion in 1986 in one of Chernobyl power station's reactors caused the worst nuclear accident in history. The sign reads: "Chernobyl". REUTERS/Ilya Naymushin (RUSSIA DISASTER ANNIVERSARY SOCIETY)
REUTERS/ILYA NAYMUSHIN